A) 21
B) 63
C) 3969
D) None of these
Correct Answer: B
Solution :
\[\because \] \[\frac{x}{21}\times \frac{x}{189}=1\] \[\Rightarrow \] \[{{x}^{2}}=21\times 189\] \[\Rightarrow \] \[x=\sqrt{21\times 21\times 3\times 3}\] \[=21\times 3=63\]You need to login to perform this action.
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